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Sept. 20Q1927. 1,642,691

0. P. NYSTROM ET AL JOINT FORMING momma Filed March 17, 1925 4 Sheets-Sheet l 'mvenfors OscarPNgsfrom John KnoH o. P. NYSTROM ET AL 164269l JOINT FORMING MACHINE Filed March 17, 1923 4 5heets 5heet 2 In 1) anfo r- 5 OssarPNgsfrom 3 John Knoll Momm- 1,642,691 Sept. 20, 1927. p, NYSTROM ET AL JOINT FORMING MACHINE Filed March 17; 1923 4 Sheets-Sheet 3 Mew. Oscar? Ngsfrom John Knoll fifwfl/ flfiorneg.

q. 20.11927. 1,642,691 O. P. NYSTROM ET AL. I

JOINT FORMING MACHINE Filed March 17, 1 4 Sheets-Sheet 4 IM l "'i /i l w r Oscor'RNgsTrom John KnoH Patented Sept. 20, 1927.

UNITEDHSTATES PATENT OFFICE.

oscan r. NYSTBOM ANnJoHn KNOLL; or HOLLAND, MICHIGAN, assrenons 'ro HOLLAND FURNACE COMPANY. or HOLLAND, MICHIGAN, A eonroaacrron or MIGHIG AN.

JOINT-FORMING MACHINE.

' Application filed March 17, 1923. Serial No. 625,810.

Thisinvention relates to a machine for use in forming joints in pipe or other similar sheet metal devices longitudinally thereof, the machine being designed to form in- 5 terengaging joint portions at opposed longitudmal edges of a length of sheet metal which is later to be bent into pipe form, the said joint portions joining together and then being securely closed and clinched to vether to make a secure and strong joint or l ongitudinal seam. It is primary object and purpose of the present invention to make a machine of this character wherein the opposed longitudinal edges of a length of sheet metal may be thus formed perfectly for .the purposes stated and with rap1d1ty, a large quantit production being had. Further objects o the invention are to provide a ma chine-of the character outlined with many novel constructions and arrangements of parts for the effective production of the work stated, and one that is durable and eflicient in every particular forthe purposes for which it is designed. These objects and purposes, togetherwith many others at this time not specifically stated will beapparent as understanding of theinvention is hadfrom the following description, taken in connection with the accompanying drawings,in 1m which, a i

Fig. 1 is a front elevation of the machine. Fig. 2 is an end elevation thereof. Fig. 3 is a fragmentary detail, partly in vertical section, to illustrate one of the punch operating means.

Fig. 4 is a fragmentary enlarged vertical section through the upper portion of the machine.

Fig. 5 is a fragmentary perspective View of a sheet of metal showing the tion formed at an edge thereof. a

Fig. 6 is a fragmentary enlargedvertic'al section through the upper' portion of the.

position machine showing the partsin the they occupy in the first step of thejomt portion formation, and r 1 Fi .7 is a View similar to that shown in Fig.. 7, showing the final step of the operation.

Like reference characters r efer to like joint por-' 'parts in thedifferent figures of the draw mgs. t

In the construction of the machine, a supporting frame is made comprising two spaced apart end members 1 which, at their upper ends are extended. upwardly to make two vertical guides 2 and 3 with a vertical guide slot 4 between them. The guide 3 is considerably wider-than the guide 2 and a bar 3 lies across the, upper ends of both guides and across the slot 4 between them, being permanently secured in place in any suitable manner, as shown. A heavy and strong horizontal member in the form of an I-beam substantially, and having an upper horizontally located flange 5 and a depending vertical Web 6 is disposed between the end members 1 substantially at the lower ends of the guide slots 4, having bracket ends 7 which are permanently secured to the members 1. by bolts or other suitable securing means. A table 8 extends outwardly at the. front side of the flan e 5 and is supported at its outer portions by suitable braces 9 leading down to a rod 9 disposed between the members 1. t In the upper side of the flange 5 and directly over the web 6 a die 10 islocated and seated in a longitudinal channel formed in the upper side ofsaid flange 5. The upper side of the die' at its front is flush with the upper side of the; flange 5 but at its rear extends above the upper side of flange 5, as indicated at 11, there being a longitudinal recess 12 made in thedie in front of the higher portion 1 1, as shown. Back of the die a bar 13 is secured which extends above the higher ,portion 11 of the die and serves as a stop bar for the edge of a sheet of metal placed in.the machine over the die and the table 8.

A number of pins 14 are seated inrecesses made in the web 6 and extend upwardly through openings in the die, being normally held in upper. positionfby springs, 15, the same serving to carry the edge ofthe metal sheet over the. higher portion 11 of thedie when the sheet is inserted into the machine (see Fig. 4).

A beam 16 is disposed horizontally between, the upper parts of the end members 1 and extends through the guide slots 4 being formed with a vertical sleeve 17 at each end. On the front side of the beam a heavy bar 18 is located, at its lower edge extending below the lower edge of the beam and formed with a rearwardly turned foot 19. The bar, adjacent each end is formed with an upwardly projecting lug 20 in which and ad jacent portions of the bar, a vertical slot 21 is cut, a set screw 22 passing through the slot into the beam 16, whereby the bar 18 is permitted vertical movements with respect to the beam. A rod 23, threaded at both ends is secured at its lower end to the bar 18 near each slot therein and extends upwardly and passes through a forwardly ward until nuts 25 engage against the cars 24. On the rear side of the beam a punch 28 is secured by bolts 29, the punch as well as the bar 18 being nearly as long as the beam 16, and the punch extending a distance 1 below the beam, as shown.

In the wider guides 3 diagonally located slots 30 are out. A second beam or bar 31 is disposed between the guides 3 and passes through the slots 30, at each end being formed with a sleeve 32 paralleling the width of the bar 31. A second punch 33 is secured to a side of the bar 31 by set screws 33, the punch extending downwardly beyond the lower edge of the bar and being pointed toward the recess 12 in the die 10, the punch 28 being directly over said recess.

A shaft 35 is horizontally mounted on and between the lower portions of the end members 1, extending through the same and having an eccentric 36 secured at each end. An eccentric housing 37 is located around each eccentric, from the upper side of each of which a lug '38 projects to which the lower end of a rod 39 is secured. Rods 39 extend upwardly and pass through the sleeves 17 at the endsof the beam 16. The upper ends of therods 39 are threaded to receive nuts 40, one being located above and another below each sleeve 17 to make a secure but adjustable connectionof the rods to the beam 16. It is evident that with each rotation of the shaft 35, the beam 16 is moved downwardly and then upwardly toinitial position.

A lever 41 is positioned substantially horizontally at each end of the machine and pivotally connected at 42 to each end member. At one end a hook member 43 is secured to the end of which a spring 44 is secured, said spring being also attached to the member 1, the tendency of the spring being to draw the lever in a downward direction. A sleeve 45 is located on the shaft 35 alongside of each eccentric 36 and at one point is formed with a radially projecting boss 46. The lever 41 on its under side is provided with a downwardly projecting boss 47 and in the rotation of the sleeve its boss 46 rides under the boss 47 on the lever, tilting the lever against the spring 44 and momentarily elevating the end of the lever to which the spring is connected and depressing the opposite end. The opposite end of the lever is inclined upwardly, as indicated at 41*. A rod 48 is connected at its lower end to each part 41 of the two levers 41, and extends diagonally upward to and through the sleeve 32 at the same end of the bar 31, being adjustahly secured thereto by nuts 49 in the same manner that rods 39 are connected by nuts to the beam 16. \Vith each revolution of the shaft 35, accordingly, there is a downward movement of bar 31 and attached punch 33 followed by an upward movement to initial position; and the location of the bosses 46 on the sleeves is such that this movement starts after the beam 16 with its attached punch 28 has begun its return upward movement.

The shaft is adapted to be driven through one complete revolution at a time, the operator stepping on the foot board 50 whenever the shaft is to be rotated, whereupon the automatic clutch and driving mechanism, indicated as a whole at 51 is connected with the shaft during-the time it takes to drive it through one revolution, automatically disconnecting therefrom at the completion of the revolution. This is an old and well known form of mechanical construction, used in punch presses and other machines of like character in which a trip means is used to connect ashaft with a driving means to drive the shaft one revolution when the trip mechanism is tripped.

YVith the construction as thus described, the plates of sheet metal, shown at 52 are placed in the machine over the table 8 and the die 10 until stopped by the stop bar 13, as shown in Fig. 4. The plates are placed in the machine one at a time. After being properly located, the mechanism is started in operation by the operator depressing the foot board 50 whereupon shaft 35 turns through one complete revolution. As a consequence, the beam 16 with attached bar 18 and punch 28 is moved downwardly, the foot portion 19 of bar 18 first coming against the sheet metal plate 52 directly at the front of the recess 12 in the die. As the downward movement of the beam continues, springs 23 are compressed so that the bar 18 clamps the sheet metal plate against the upper side of flange 5 and with further downward movement, the punch 28 comes against the metal and forces it down into the recess 12, as shown in Fig. 6, the metal first bending downwardly at an angle as indicated at 53, thence horizontally as indicated at 54; to lie against the bottom of the die recess 12, the edge portion being turned upwardly at right angles to make a terminal lip 55 which lies between the side of the punch and the higher portion 11 of the die, as shown in Fig. 6. The continued movement of the shaft 35 causes the beam 16 and attached punch 28 to be elevated and when in partly elevated state and before the foot 19 has been moved from the plate, the rods 48 are reciprocated in a downward direction, moving the bar 31 and attached punch diagon ally downward and inward toward the upwardly extending lip 55, the punch engaging thereagainst and bending it toward the front as shown in Fig. 7 so that said lip lies at an acute angle with the adjacent portion 54. The bar 31 and attached punch 33 i1nmediately returns to initial position under the influence of springs 44 and the beam 16 and connected parts continue to return to their initial positions, stopping with the stopping of the rotation of shaft 35 when it has com pleted one revolution, as described.

Thesheet of metal 52 may be turned over and the opposite edge formed in a like manner. The sheet of metal may then be formed into any desired shape of pipe,

the edges thus formed being ready for mterlocking, and with a closing down of the interengaging lips 55, a secure seam connec tion is made. The machine described is very practical, eflicient and durable and fulfills the purposes for which designed in an exceptionally satisfactory manner, as has been proved in practice.

e claim:

1. In a machine of the class described, a support, a horizontal die carried on the support over which an edge portion of a sheet of metal is adapted to be placed, a beam mounted directly over the die, means for moving said beam downwardly and then upwardly to initial position, a punch attached to the lower part of the beam to form the metal in conformity to the die, a bar slidably mounted on the beam at the slde thereof opposite the punch, said bar extending below the lower end of the punch and terminating in a horizontal foot portion adapted to bear against the metal on downward movement of the beam andbefore the punch reaches said metal. yielding spring means actingto normally force the said bar to lower position. a second bar mounted to move downwardly and inwardly at an angle to the movement of the beam, means for moving said second bar downwardly and inwardly after the beam has started its upward movement but before the said foot portion of the first bar has disengaged from the metal, means for returning the second bar to initial position after it has moved downwardlyand inwardly a predetermined distance, and a punch attached to the lower part of said second bar.

2. In a machine of the class described, a supporting frame including vertical end members. each at its upper end having a ver tical guide slot and an inclined guide slot, at supporting member horizontally located between the end members and attached at its ends thereto. a die secured in the upper side of said supporting member, a beam located above the die and slidably mounted at its ends in the vertical guide slots, a rotatably mounted shaft adapted to rotate through one revolution, means actuated by the shaft and connected to the beam for moving the beam downwardly and then upwardly with each revolution of the shaft, a punch attached to the under side of the beam to cooperate with the die to form sheet metal placed ov r the die and under the punch, a bar deposed at an angle to the vertical and carried at one side of the vertical guide siots by said inclined guide slots through which the ends of the bar pass, a second punch attached to the under side of the bar, a lever pivotally mounted between its ends on each of the vertical end members, each lever extending over the shaft, cams on the shaft against which said levers bear, springs attached one to one end of each lever normally holding the levers against said cams, and rods connecting the opposite ends of the levers to said bar, sul'istantially as described.

3. In a machine of the class described, supporting frame including spaced apart vertical end members formed at their upper ends with vertical and inclined slots therein, a beam mounted in said vertical slots for slidable movements in a vertical plane. a bar mounted in said inclined slots for slidable movement in a plane inclined to the vertical, a punch attached at the lower side of the beam, at second punch attached tothe lower side of the bar. a supporting beam located between the end members and attached in horizontal position thereto, a die carried by said supporting means directly below the first named punch, a rotatably mounted shaft, an eccentric at each end, a rod attach-ed to each eccentric at one end and at the other end to an end of the first beam, a lever pivotally mounted between its ends to each end member and extending across the shaft, a sleeve formed with a radially projecting boss on the shaft under each lever, a spring connected to one end of the levers for drawing it down against its sleeve. and a rod connected with the opposite end of the levers and extending upwardly to and connecting with an. end of the bar, substantially as described.

4.. A construction containing the elements in combination defined in claim 3, combined with a clamping bar mounted on the beam and extending below the same and terminating in a foot means for slida ol mounting said bar on the beam for limited vertical movements, and spring means normally holding the bar in a lower position, but

yielding to permit downward movement of he beam while the bar is held relatively fixed, substantially as described.

In testimony whereof we aifix our signalures.

OSCAR P. NYSTROM. JOHN KNOLL. 

